49 lines
1.5 KiB
Rust
49 lines
1.5 KiB
Rust
// Ensures the independence of each side in `binding @ subpat`
|
|
// determine their binding modes independently of each other.
|
|
//
|
|
// That is, `binding` does not influence `subpat`.
|
|
// This is important because we might want to allow `p1 @ p2`,
|
|
// where both `p1` and `p2` are syntactically unrestricted patterns.
|
|
// If `binding` is allowed to influence `subpat`,
|
|
// this would create problems for the generalization aforementioned.
|
|
|
|
|
|
fn main() {
|
|
struct NotCopy;
|
|
|
|
fn f1(a @ b: &NotCopy) { // OK
|
|
let _: &NotCopy = a;
|
|
}
|
|
fn f2(ref a @ b: &NotCopy) {
|
|
let _: &&NotCopy = a; // Ok
|
|
}
|
|
|
|
let a @ b = &NotCopy; // OK
|
|
let _: &NotCopy = a;
|
|
let ref a @ b = &NotCopy; // OK
|
|
let _: &&NotCopy = a;
|
|
|
|
let ref a @ b = NotCopy; //~ ERROR cannot move out of value because it is borrowed
|
|
let _a: &NotCopy = a;
|
|
let _b: NotCopy = b;
|
|
let ref mut a @ b = NotCopy; //~ ERROR cannot move out of value because it is borrowed
|
|
//~^ ERROR borrow of moved value
|
|
let _a: &NotCopy = a;
|
|
let _b: NotCopy = b;
|
|
match Ok(NotCopy) {
|
|
Ok(ref a @ b) | Err(b @ ref a) => {
|
|
//~^ ERROR cannot move out of value because it is borrowed
|
|
//~| ERROR borrow of moved value
|
|
let _a: &NotCopy = a;
|
|
let _b: NotCopy = b;
|
|
}
|
|
}
|
|
match NotCopy {
|
|
ref a @ b => {
|
|
//~^ ERROR cannot move out of value because it is borrowed
|
|
let _a: &NotCopy = a;
|
|
let _b: NotCopy = b;
|
|
}
|
|
}
|
|
}
|